Lake Raleigh Wetland Creation Feasibility Study NC State Centennial Campus Melanie Carter, Jennifer...
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Transcript of Lake Raleigh Wetland Creation Feasibility Study NC State Centennial Campus Melanie Carter, Jennifer...
Lake Raleigh Wetland CreationFeasibility Study
NC State Centennial CampusMelanie Carter, Jennifer Burdette, Amanda Jones
•Purpose Determine if a wetland could be created in a designated open space on Centennial Campus
•Proposed Project Riverine Wetland Creation -- Groundwater, stormwater, and overbank flow inputs -- Native wetland vegetation -- Wildlife Habitat Pedestrian Greenway and Access
• History
Stormwater pond and proposed wetland location “built” in early 1990’s
Project Description
Existing Conditionso Site Description and Land Useo Physical & Natural Resources
• Soils • Hydrology• Vegetation• Geology• Flood Hazard
o Cultural Resources
Feasibility Study Components
Feasibility Study Components(cont’d)
o Chain-of-Titleo Environmental Hazard Assessmento Jurisdictional Issues
• Waters of the US (Section 404)• Protected Species• Riparian Buffers
o Constraints
Site Description &
Land Use
Existing Site Conditions
• Study Site (~2 acres)
Semi-natural landscape with
planned pedestrian trail
•West Boundary
Perennial Stream and Forebay
• East Boundary
Herbaceous Upland Slope
Existing Site Conditions – Soils
Map Unit Name (Series and Phase): Cecil Clay Loam, 10-20%, Severely Erod. Drainage Class:Well Drained Taxonomy (Subgroup): Typic Hapludult Confirm Mapped Type? Yes No X Profile Description: Depth Matrix Colors Mottle Colors Mottle Texture, Concretions, (inches) Horizon (Munsell Moist) (Munsell Moist) Abundance/Contrast Structure, etc.
0-5 ? 7.5YR 4/6 none n/a silt loam
5-12 ? 7.5YR 4/4 none n/a loam
12-20 ? 10YR 4/4 10YR 4/2 many/prominent sandy loam
Hydric Soil Indicators: Histosol Concretions Histic Epipedon High Organic Content in Surface Layer in Sandy Soils Sulfidic Odor Organic Streaking in Sandy Soils Aquic Moisture Regime Listed On Local Hydric Soils List Reducing Conditions Listed on National Hydric Soils List Gleyed or Low-Chroma Colors Other (Explain in Remarks)
Remarks: No Indicator Met
Existing Site Conditions – Soils Map Unit Name (Series and Phase): Worsham Sandy Loam Drainage Class: Poorly Drained Taxonomy (Subgroup): Typic Ochraquults Confirm Mapped Type? Yes No X Profile Description: Depth Matrix Colors Mottle Colors Mottle Texture, Concretions, (inches) Horizon (Munsell Moist) (Munsell Moist) Abundance/Contrast Structure, etc.
0-7 ? 10YR 4/4 10YR 4/2 many/prominent silty clay loam
7-13 ? 10YR 4/4 10YR 4/2 many/prominent silt loam
13-24 ? 5Y 5/1 none n/a coarse sand
Hydric Soil Indicators: Histosol Concretions Histic Epipedon High Organic Content in Surface Layer in
Sandy Soil Sulfidic Odor Organic Streaking in Sandy Soils Aquic Moisture Regime Listed On Local Hydric Soils List Reducing Conditions Listed on National Hydric Soils List Gleyed or Low-Chroma Colors Other (Explain in Remarks)
Remarks: No Indicator Met
Existing Conditions -- Hydrology
DETAIL
Existing Site Conditions
Jurisdictional Issues
• Area of construction located above ordinary high water mark of perennial stream and does not contain jurisdictional wetlands– No Section 404/401 permit from US Army Corps of Engineers or
NC Division of Water Quality required• Area for proposed wetland creation located within Neuse River Basin
Riparian Buffer– No Neuse River Riparian Buffer Compliance required from NC
Division of Water Quality
ConceptualWetland Design
DETAIL
•Create level area east of stream channel
•Divert ephemeral drainage through constructed wetland
•Build a low levee along perennial channel to detain portion of ephemeral drainage
EphemeralDrainage
Proposed Levee
Area to beLeveled
Conceptual Wetland DesignCross-section
SeasonalHigh WaterTable
Existing Grade
Proposed Grade
PerennialStream
PedestrianTrail
Suggested Wetland Plants
Lizard’s Tail
Swamp Rose
Spicebush
Buttonbush
Jack-in-the-PulpitPhotos courtesy of USDA PLANTS Databasehttp://plants.usda.gov/
• FEMA 100-yr Floodplain Boundary (Red)
• Sewer Line Amendments (Blue)
• Grading Costs (Gray)
• Pedestrian Greenway Access
• Maintenance
Project Constraints